I was playing through one of the skirmish maps and I came along the wreckage of both a Mammoth Mk.II and a Titan from Tiberian Sun. I asked the community manager about it and he said that the models are included in the game with full walking animations specifically for modding purposes. I think its very cool that EA took the time to add something like that in just for the old fans and I can't wait for someone to mod them in.